Widely-used PHP XML security library; high-severity cryptography flaw enabling data decryption and ciphertext forgery across apps.
CVE-2026-32313
xmlseclibs <3.1.5 tag-length validation bypass enables decryption and ciphertext forgery.
Is CVE-2026-32313 being exploited?
Not confirmed. CVE-2026-32313 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.15% probability of exploitation in the next 30 days.
How severe is CVE-2026-32313?
CVE-2026-32313 is rated High with a CVSS score of 8.2. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-32313?
Yes. A fix has been recorded for CVE-2026-32313. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-32313 affect?
CVE-2026-32313 affects xmlseclibs (PHP) <= 3.1.4. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-32313?
Upgrade to 3.1.5+; audit all deployments using xmlseclibs.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Tag-length validation bypass allows brute-forcing and decrypting AES-GCM data; attacker can forge ciphertexts without the key.
Patch when possible
- affected< 3.1.5
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.