HighGHSA-2528-jw5q-ww88CVE-2024-27354

phpseclib: guardrails needed on isPrime and randomPrime

Published 6 May 2026 · Updated 6 May 2026

Affected packages

phpseclib/phpseclibComposer

Affected: >=0.1.1 <1.0.23
Fixed in: 1.0.23

Update to the fixed version for your release line, for example:composer require phpseclib/phpseclib:^1.0.23

phpseclib/phpseclibComposer

Affected: >=2.0.0 <2.0.47
Fixed in: 2.0.47

Update to the fixed version for your release line, for example:composer require phpseclib/phpseclib:^2.0.47

phpseclib/phpseclibComposer

Affected: >=3.0.0 <3.0.36
Fixed in: 3.0.36

Update to the fixed version for your release line, for example:composer require phpseclib/phpseclib:^3.0.36

Details

Impact

Anyone trying to generate a prime and testing the primality of a number.

Patches

https://github.com/phpseclib/phpseclib/commit/ad5dbdf2129f5e0fb644637770b7f33de8ca8575

Workarounds

Using the GMP extension would probably help, assuming that one has its own guardrails.

Resources

https://github.com/phpseclib/phpseclib/commit/ad5dbdf2129f5e0fb644637770b7f33de8ca8575 https://www.usenix.org/system/files/conference/usenixsecurity25/sec25cycle1-prepub-599-shi-bing.pdf

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References

Advisory data from OSV.dev (opens OSV.dev in a new tab), refreshed daily.