CVE-2026-41677: Openssl Rust-opennssl Has An Out-of-bounds Read Vulnerability

LOW
Advisory Identifier: GHSA-xmgf-hq76-4vx2
Share
CWE-125 CWE-1284
Published
Advisory Summary

CVE-2026-41677 is a LOW rust-opennssl has an out-of-bounds read vulnerability (CWE-125: Out-of-bounds Read) affecting Openssl libraries in the crates.io ecosystem. The issue involves rust-opennssl has an out-of-bounds read in pem password callback when returning an oversized length. Remediation is available by upgrading affected packages to version 0.10.78.

CVE-2026-41677 at a Glance

CVE Identifier CVE-2026-41677
GHSA Identifier GHSA-xmgf-hq76-4vx2
Severity LOW
CVSS v3.1 Base Score N/A
CWE Classification CWE-125: Out-of-bounds Read
Affected Product Openssl
Package Ecosystem crates.io
Published Date
Last Updated

How to Fix CVE-2026-41677

To remediate this vulnerability, upgrade all affected Openssl dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

openssl fixed: 0.10.78 
Upgrade openssl to 0.10.78
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

inspect dependencies for openssl

How to Check if You Are Affected

To determine whether your application is affected by CVE-2026-41677, inspect your project dependencies for Openssl:

inspect dependencies for openssl

Analyze the terminal output to locate any version of Openssl in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 0.10.78), your application is affected.

Note: Verify declared build manifests and deployed runtime container environments.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-125: Out-of-bounds Read, where the product reads data past the end, or before the beginning, of the intended buffer. In Openssl, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

The `*_from_pem_callback` APIs did not validate the length returned by the user's callback. A password callback that returns a value larger than the buffer it was given can cause some versions of OpenSSL to over-read this buffer. OpenSSL 3.x is not affected by this.

CVE-2026-41677 Affected Openssl Versions

1 component(s)
Fixed Versions:
0.10.78
Product / Package Ecosystem Affected Versions Fixed Version
openssl
 crates.io
≥ 0.9.0
< 0.10.78
0.10.78

References

GitHub Advisory / Wiki ADVISORY
https://github.com/rust-openssl/rust-openssl/security/advisories/GHSA-xmgf-hq76-4vx2
NVD — CVE-2026-41677 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-41677
Openssl Source Repository REPOSITORY
https://github.com/rust-openssl/rust-openssl/pull/2605
Security Fix Commit FIX COMMIT
https://github.com/rust-openssl/rust-openssl/commit/5af6895c907773699f37f583f409b862284062b1
Openssl Source Repository REPOSITORY
https://github.com/rust-openssl/rust-openssl
Openssl Release RELEASE
https://github.com/rust-openssl/rust-openssl/releases/tag/openssl-v0.10.78

Frequently Asked Questions

What is CVE-2026-41677?
CVE-2026-41677 is a security vulnerability in Openssl involving rust-opennssl has an Out-of-bounds read in PEM password callback when returning an oversized length under CWE-125: Out-of-bounds Read.
Which Openssl versions are affected?
Affected versions include releases prior to 0.10.78 across affected packages: openssl.
What version fixes CVE-2026-41677?
Upgrading to 0.10.78 (or the latest patched release for your respective branch) resolves the vulnerability.
Is openssl affected?
Yes, openssl is affected in releases prior to 0.10.78. Upgrade your dependency to 0.10.78 or later.
What CWE is associated with CVE-2026-41677?
CVE-2026-41677 is classified under CWE-125: Out-of-bounds Read (The product reads data past the end, or before the beginning, of the intended buffer.).
How can I check crates.io dependencies for CVE-2026-41677?
Run the dependency tree command: 'inspect dependencies for openssl'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-xmgf-hq76-4vx2",
  "modified" : "2026-04-27T16:41:58Z",
  "published" : "2026-04-22T21:20:04Z",
  "aliases" : [ "CVE-2026-41677" ],
  "summary" : "rust-opennssl has an Out-of-bounds read in PEM password callback when returning an oversized length",
  "details" : "The `*_from_pem_callback` APIs did not validate the length returned by the user's callback. A password callback that returns a value larger than the buffer it was given can cause some versions of OpenSSL to over-read this buffer. OpenSSL 3.x is not affected by this.",
  "severity" : [ {
    "type" : "CVSS_V4",
    "score" : "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:L/SC:N/SI:N/SA:N/E:U"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "crates.io",
      "name" : "openssl"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0.9.0"
      }, {
        "fixed" : "0.10.78"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/rust-openssl/rust-openssl/security/advisories/GHSA-xmgf-hq76-4vx2"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-41677"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/rust-openssl/rust-openssl/pull/2605"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/rust-openssl/rust-openssl/commit/5af6895c907773699f37f583f409b862284062b1"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/rust-openssl/rust-openssl"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/rust-openssl/rust-openssl/releases/tag/openssl-v0.10.78"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-125", "CWE-1284" ],
    "severity" : "LOW",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-04-22T21:20:04Z",
    "nvd_published_at" : "2026-04-24T18:16:29Z"
  }
}