CVE-2026-4428

CRL Distribution Point Scope Check Logic Error in AWS-LC

CVSS 3.1 7.4 HIGHCVSS 4.0 9.1 CRITICALEUVD CVSS 4.0 9.1 CVSS 4.0 · ff89ba41-3aa1-4d27-914a-91399e9639e5 · Secondary 9.1 CRITICALCVSS 3.1 · ff89ba41-3aa1-4d27-914a-91399e9639e5 · Secondary 7.4 HIGHCVSS_V3 Publisher rating HIGHFixed by aws-lc-fips-sys 0.13.13 Fixed by aws-lc-sys 0.39.0CVSS_V3 Fixed by aws-lc-fips-sys 0.13.13CVSS_V3 Fixed by aws-lc-sys 0.39.0KEV status unknown

Original advisory

cve-program · CVE-2026-4428

Published

A logic error in CRL distribution point validation in AWS-LC before 1.71.0 causes partitioned CRLs to be incorrectly rejected as out of scope, which allows a revoked certificate to bypass certificate revocation checks. To remediate this issue, users should upgrade to AWS-LC 1.71.0 or AWS-LC-FIPS-3.3.0.

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euvd · EUVD-2026-13237

Published

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nvd · CVE-2026-4428

Published

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osv · GHSA-9f94-5g5w-gf6r

Published

### Summary AWS-LC is an open-source, general-purpose cryptographic library. ### Impact A logic error in CRL distribution point matching in AWS-LC allows a revoked certificate to bypass revocation checks during certificate validation, when the application enables CRL checking and uses partitioned CRLs with Issuing Distribution Point (IDP) extensions. Customers of AWS services do not need to take action. aws-lc-sys and aws-lc-fips-sys contain code from AWS-LC. Applications using aws-lc-sys or aws-lc-fips-sys should upgrade to the most recent releases of aws-lc-sys or aws-lc-fips-sys. ### Impacted versions: * aws-lc-sys >= v0.15.0, < v0.39.0 * aws-lc-fips-sys >= v0.13.0, < v0.13.13 ### Patches The patch is included in aws-lc-sys v0.39.0 and aws-lc-fips-sys v0.13.13. ### Workarounds Applications can workaround this issue if they do not enable CRL checking (X509_V_FLAG_CRL_CHECK). Applications using complete (non-partitioned) CRLs without IDP extensions are also not affected. Otherwise, there is no workaround and applications using aws-lc-sys or aws-lc-fips-sys should upgrade to the most recent releases of aws-lc-sys or aws-lc-fips-sys. ### References If you have any questions or comments about this advisory, we ask that you contact AWS Security via our [vulnerability reporting page](https://aws.amazon.com/security/vulnerability-reporting/) or directly via email to [[email protected]](mailto:[email protected]). Please do not create a public GitHub issue.

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osv · RUSTSEC-2026-0042

Published

A logic error in CRL distribution point matching in AWS-LC allows a revoked certificate to bypass revocation checks during certificate validation, when the application enables CRL checking and uses partitioned CRLs with Issuing Distribution Point (IDP) extensions. Customers of AWS services do not need to take action. `aws-lc-fips-sys` contains code from AWS-LC. Applications using `aws-lc-fips-sys` should upgrade to the most recent release of `aws-lc-fips-sys`. ## Workarounds Applications can workaround this issue if they do not enable CRL checking (`X509_V_FLAG_CRL_CHECK`). Applications using complete (non-partitioned) CRLs without IDP extensions are also not affected. Otherwise, there is no workaround and applications using `aws-lc-fips-sys` should upgrade to the most recent releases of `aws-lc-fips-sys`.

Read the publisher's advisory

osv · RUSTSEC-2026-0048

Published

A logic error in CRL distribution point matching in AWS-LC allows a revoked certificate to bypass revocation checks during certificate validation, when the application enables CRL checking and uses partitioned CRLs with Issuing Distribution Point (IDP) extensions. Customers of AWS services do not need to take action. `aws-lc-sys` contains code from AWS-LC. Applications using `aws-lc-sys` should upgrade to the most recent release of `aws-lc-sys`. ## Workarounds Applications can workaround this issue if they do not enable CRL checking (`X509_V_FLAG_CRL_CHECK`). Applications using complete (non-partitioned) CRLs without IDP extensions are also not affected. Otherwise, there is no workaround and applications using `aws-lc-sys` should upgrade to the most recent releases of `aws-lc-sys`.

Read the publisher's advisory

Affected versions, risk and source history

Exploitation and risk

Source status

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No exploitation or prediction data is available here for these CVEs. This does not mean they are safe or unlikely to be exploited.

cve-program · CVE-2026-4428

Published

CRL Distribution Point Scope Check Logic Error in AWS-LC

Source published: 19 Mar 2026 20:37:53 UTC
Source modified: 25 Mar 2026 14:13:42 UTC
Saved here: 23 Oct 2026 15:48:27 UTC
Source terms: CVE Program Terms of Use

Original source record · Cite this exact observation · Complete original publisher JSON

Source: cve-program · CVE Program Terms of Use. The publisher's wording is preserved. ChangeIntel groups the information and labels changes. The JSON record includes additional source fields.

CVSS 3.1 · 7.4 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

CVSS 4.0 · 9.1 CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N

euvd · EUVD-2026-13237

Published

A logic error in CRL distribution point validation in AWS-LC before 1.71.0 causes partitioned CRLs to be incorrectly rejected as out of scope, which allows a revoked certificate to bypass certificate revocation checks.

Additional publisher context

EUVD source date text has no stated timezone and is retained without inventing a UTC instant. Related bulletin membership is not an alias, common cause or applicability claim. A missing vector with a zero score is treated as unrated. Complete vendor/product and underlying source evidence remains in the original JSON.

Original publisher date fields

datePublished: Mar 19, 2026, 8:37:53 PM

dateUpdated: Mar 25, 2026, 2:13:42 PM

Source published: Mar 19, 2026, 8:37:53 PM (timezone not stated)
Source modified: Mar 25, 2026, 2:13:42 PM (timezone not stated)
Saved here: 13 Nov 2026 12:59:49 UTC
Source terms: ENISA EUVD · source terms and attribution apply

Original source record · Cite this exact observation · Complete original publisher JSON

Source: euvd · ENISA EUVD · source terms and attribution apply. The publisher's wording is preserved. ChangeIntel groups the information and labels changes. The JSON record includes additional source fields.

EUVD CVSS 4.0 · 9.1 CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N

nvd · CVE-2026-4428

Published

A logic error in CRL distribution point validation in AWS-LC before 1.71.0 causes partitioned CRLs to be incorrectly rejected as out of scope, which allows a revoked certificate to bypass certificate revocation checks.

Additional publisher context

NVD analysis and CPE criteria are source context, not proof that a package or your environment is affected. Complete affected data, logical configurations and SSVC are retained in the original JSON.

Source analysis status: Awaiting Analysis

Weakness classifications: CWE-299

Original publisher date fields

published: 2026-03-19T21:17:14.170

lastModified: 2026-06-17T10:56:33.390

Source published: 19 Mar 2026 21:17:14 UTC
Source modified: 17 Jun 2026 10:56:33 UTC
Saved here: 25 Oct 2026 10:17:21 UTC
Source terms: NIST NVD usage terms; underlying source attribution retained

Original source record · Cite this exact observation · Complete original publisher JSON

Source: nvd · NIST NVD usage terms; underlying source attribution retained. The publisher's wording is preserved. ChangeIntel groups the information and labels changes. The JSON record includes additional source fields.

CVSS 4.0 · ff89ba41-3aa1-4d27-914a-91399e9639e5 · Secondary · 9.1 CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

CVSS 3.1 · ff89ba41-3aa1-4d27-914a-91399e9639e5 · Secondary · 7.4 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

osv · GHSA-9f94-5g5w-gf6r

Published

CRL Distribution Point Scope Check Logic Error in AWS-LC

Source published: 20 Mar 2026 20:35:14 UTC
Source modified: 10 Sep 2026 03:50:38 UTC
Saved here: 24 Oct 2026 13:19:54 UTC
Source terms: GitHub Advisory Database · CC-BY-4.0

Original source record · Cite this exact observation · Complete original publisher JSON

Source: osv · GitHub Advisory Database · CC-BY-4.0. The publisher's wording is preserved. ChangeIntel groups the information and labels changes. The JSON record includes additional source fields.

CVSS_V3 · CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

Publisher rating · HIGH

osv · RUSTSEC-2026-0042

Published

CRL Distribution Point Scope Check Logic Error in AWS-LC

Source published: 19 Mar 2026 12:00:00 UTC
Source modified: 9 Nov 2026 11:00:04 UTC
Saved here: 9 Nov 2026 12:02:17 UTC
Source terms: OSV · upstream source license applies

Original source record · Cite this exact observation · Complete original publisher JSON

Source: osv · OSV · upstream source license applies. The publisher's wording is preserved. ChangeIntel groups the information and labels changes. The JSON record includes additional source fields.

CVSS_V3 · CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

osv · RUSTSEC-2026-0048

Published

CRL Distribution Point Scope Check Logic Error in AWS-LC

A logic error in CRL distribution point matching in AWS-LC allows a revoked certificate to bypass revocation checks during certificate validation, when the application enables CRL checking and uses partitioned CRLs with Issuing Distribution Point (IDP) extensions. Customers of AWS services do not need to take action. `aws-lc-sys` contains code from AWS-LC. Applications using `aws-lc-sys` should upgrade to the most recent release of `aws-lc-sys`. ## Workarounds Applications can workaround this issue if they do not enable CRL checking (`X509_V_FLAG_CRL_CHECK`). Applications using complete (non-partitioned) CRLs without IDP extensions are also not affected. Otherwise, there is no workaround and applications using `aws-lc-sys` should upgrade to the most recent releases of `aws-lc-sys`.

Source published: 19 Mar 2026 12:00:00 UTC
Source modified: 9 Nov 2026 11:00:03 UTC
Saved here: 9 Nov 2026 12:02:17 UTC
Source terms: OSV · upstream source license applies

Original source record · Cite this exact observation · Complete original publisher JSON

Source: osv · OSV · upstream source license applies. The publisher's wording is preserved. ChangeIntel groups the information and labels changes. The JSON record includes additional source fields.

CVSS_V3 · CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N