[release-branch.go1.24] crypto/x509: avoid panic when parsing partial PKCS#1 private keys

These keys are off-spec, but have historically been accepted by
ParsePKCS1PrivateKey.

Thanks to Philippe Antoine (Catena cyber) for reporting this issue.

Fixes #71216
Fixes CVE-2025-22865

Change-Id: I6a6a46564156fa32e29e8d6acbec3fbac47c7352
Reviewed-on: https://go-internal-review.googlesource.com/c/go/+/1820
Reviewed-by: Tatiana Bradley <tatianabradley@google.com>
Reviewed-by: Damien Neil <dneil@google.com>
Commit-Queue: Roland Shoemaker <bracewell@google.com>
(cherry picked from commit 36c6c8b6957e155770461fd710aea9477ef3bc88)
Reviewed-on: https://go-internal-review.googlesource.com/c/go/+/1841
Reviewed-on: https://go-review.googlesource.com/c/go/+/643102
Auto-Submit: Michael Knyszek <mknyszek@google.com>
Reviewed-by: Michael Pratt <mpratt@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
2 files changed
tree: a55311a87e56567f1ccafe7416c49910f4aad9d8
  1. .github/
  2. api/
  3. doc/
  4. lib/
  5. misc/
  6. src/
  7. test/
  8. .gitattributes
  9. .gitignore
  10. codereview.cfg
  11. CONTRIBUTING.md
  12. go.env
  13. LICENSE
  14. PATENTS
  15. README.md
  16. SECURITY.md
  17. VERSION
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