PatchTheCVECVE-2024-13939: String::Compare::ConstantTime for Perl through 0.321 is vulnerable to timing attacks that allow an attacker to
CVE-2024-13939 is a high-severity flaw (CVSS 7.5) affecting string\. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
String::Compare::ConstantTime for Perl through 0.321 is vulnerable to timing attacks that allow an attacker to guess the length of a secret string. As stated in the documentation: "If the lengths of the strings are different, because equals returns false right away the size of the secret string may be leaked (but not its contents)." This is similar to CVE-2020-36829
Why this priority
- High severity
- Remotely exploitable, no login, no user action
A fixed release or distro patch exists.
Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score
Am I affected?
Timeline
- Published CVE record published
- Updated Record last modified
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Quick answers
How do I fix CVE-2024-13939?
string\: upgrade to newer than 0.321. Exact commands for each OS are on this page.
Is CVE-2024-13939 being exploited?
CVE-2024-13939 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.
What does CVE-2024-13939 affect?
CVE-2024-13939 affects string\. Severity is high (CVSS 7.5). String::Compare::ConstantTime for Perl through 0.321 is vulnerable to timing attacks that allow an attacker to guess the length of a secret string. As stated in the documentation: "If the lengths of the strings are different, because equal
How urgent is CVE-2024-13939?
Priority 39/100. High severity; Remotely exploitable, no login, no user action