CVE-2023-49316

highpriority · track · 30EPSS 0.008 · 56 %ileEUUS

grimoire priorityP2 · Scheduled

Exploitable?

—

no known exploitation

Likely / severe?

0.78% (56th) EPSS

CVSS 7.5 · high

Is it mine?

3 products

Who says so?

4 sources

cnnvd · enisa_euvd · nvd · osv

EPSS · scored 2026-10-28

In Math/BinaryField.php in phpseclib 3 before 3.0.34, excessively large degrees can lead to a denial of service.

cvss

Technical severity, 0–10. One row per scoring source.

7.5

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–high · 6.9–7.5

v3.17.5highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Hprimary · NVD / NIST USexploitability 3.9 · impact 3.6

v3.17.5highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Hsecondary · OSV

v3.16.9mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:Usecondary · CVSS-BT (t0sche)

The CWE weakness classes this flaw belongs to.

Products and version ranges known to be affected.

n/a n/a≤ n/aenisa_euvdEU
phpseclib phpseclib3.0.0 → 3.0.34nvdUScpe:2.3:a:phpseclib:phpseclib:*:*:*:*:*:*:*:*
Packagist phpseclib/phpseclib3.0.0 → 3.0.34osvUSpkg:composer/phpseclib/phpseclib

Vendor and ecosystem advisories describing this.

GHSA-2f25-pfq3-c7h8Phpseclib needs guardrails on large binaryfield integers2026-05-08ghsa · osvUS
### Impact Anyone loading untrusted ASN1 files (eg. X509 certificates, RSA PKCS8 private or public keys, etc) ### Patches https://github.com/phpseclib/phpseclib/commit/964d78101a70305df33f442f5490f0adb3b7e77f ### Workarounds No. ### References https://github.com/phpseclib/phpseclib/commit/964d78101a70305df33f442f5490f0adb3b7e77f https://www.usenix.org/system/files/usenixsecurity25-shi-bing.pdf
GHSA-jpr7-q523-hx25Duplicate Advisory: phpseclib vulnerable to denial of service2023-11-27ghsa · osvUS
### Duplicate Advisory This advisory has been withdrawn because it is a duplicate of GHSA-2f25-pfq3-c7h8. This link is maintained to preserve external references. ### Original Description In Math/BinaryField.php in phpseclib 3 before 3.0.34, excessively large degrees in binary fields can lead to a denial of service.

Other names and identifiers for this entity.

Which sources assert this record, and when.

published 2023-11-27modified 2026-06-17

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External citations — patches, advisories, analysis.

scry

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